Lifting-jack.



W. H. FIREBA'UGH, JR.

Patented Feb. 25, 1919.

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W. H. FIREBAUGH, JR.

unme JACK. APPLICATION FILED SEPT. 24, I918.

Patented Feb. 25, 1919.

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W. H. HREBAUGH, In.

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APPLICATION FILED SEPT. 24, 1918. 3,295,469, Patented Feb. 25, 1919.

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,4 TTORNEKS' wnalecl on an eccentric of the gear 6 and the nutWILLIAM'I-I. FIBEBAUGH, JR, 0F BERKELEY, CALIFORNIA.

LIFTING-JACK.

Specification of Letters Patent.

. Patented Feb. 25, 1919.

Application filed September 24, 1918. Serial No. 255,447.

To all whom it may concern:

Be it known that 1, WILLIAM H. FIRE- BAUGH, Jr., citizen of the UnitedStates, residing at Berkeley, in the county of Alameda and State ofCalifornia, have invented new and useful Improvements in Lifting- Jacks,of which the following is a specification.

This invention relates to a lifting jack and particularly toimprovements on the structure shown in my co pending application, SerialNo. 231,801, entitled Jack, filed May 1, 1918.

O c of, he objects of the present invention is to provide a lifting jackfor automobiles, trucks and the like, which comprises a pedestal, alifting screw, a nut for raising or lowering the screw, and means forrotating the nut.

Another object of the invention is to provide manually operated meansfor'transmitting power to rotate the nut and particularly to provide anintermediate mechanism for transmitting a reverse movement to the nut.

Further objects will hereinafter appear.

The invention. consists of the parts and the construction, combinationand arrangement of parts as will hereinafter be more fully described andclaimed, having reference to the accompanying drawings in which I Figure1 is a side elevationof the jack partly in section. v

Fig. 2 is a side elevation taken at right angles to Fig. 1.

Fig. 3 is a plan section on line 3-3, Fig. 1.

-Referring to the drawings in detail, A indicates a pedestal, on theupper end of which is formed a vertical bearing extension 2. Extendingthrough the pedestal and the bearing extension 2 is a central passagefor the reception of a lifting screw 4. The screw 1 is carried by a nut5 which is sup ported by the bearing extension 2 and turnable thereon.Formed on the lower end of the nut is a bevel gear 6 and adapted tointermesh with said gear'is a driving pinion such as shown at 7 Thispinion is jour- 8 which is turnably mounted on a stud shaft 9, securedin the pedestal as shown. Also secured in the pedestal is a second studshaft 10 on'which' 1s Journaled a bevel gear 11. This gear remains inconsta t mesh with the gear 6 and it is employed for reversing themovement 5 carried thereby.

19 carried by a otally mounted as shown at 21, on a pm I spring isutilized be lifted in a vertical direct1on.

Formed integral with the beveled pinion 7 1s a ratchet gear 12, andjournaled on the eccentric 8 is a pulley 13, about which is wound aflexible cord 14:. One end of the cord is secured to the periphery ofthe pulley in any suitable manner while the opposite end is providedwith a handle 15. Formed on one end ofthe eccentric is an annular flange16 and secured to said flange is a drum 17 which is surrounded by a coilspring 18. The inner end of the spring is secured to the drum 17 whilethe opposite or free end of the spring is secured to a pin pawl 20. Thispawl is pivwhich is secured on the inner face of the pulley. The springis thus attached to the pulley and a partial tension is thus imparted tothe spring when the cord is unwound by a pull exerted onthe cord bymeans of a handle. 15. This tension imparted to the for the purpose ofreversing the movement of the pulley so that the cord maybe rewoundthereon after each successive pull exerted on the cord. The tension ofthe springis also imparted for the purpose of maintaining the pawl 20 inconstant engagement with the ratchet gear 12 and as this gear, togetherwith the bevel pinion v7, 1s loosely turnable on the eccentric sleeve,it can readily be seen that means have been provided for turning saidgears in unison with the pulley in one direction and that they willremain stationary when thepulley is reversed by the pull of thespringand while the cord 1 1 is being rewound.

A pull exerted on the cord, as previously described, turns the pulley inthe direction of arrow (1, see Fig. This movement of the pulley istransmitted through the pawl, to revolve the gears 7 and 12 in the samedirection and as the gear 7 is normally in mesh with the gear 6, it canreadily be seen that turning movement will be transmitted to the nut 5,which will cause the screw 4 to Reverse movement of the pulley caused bythe pull of the spring 18 permits the gears to remain stationarywhilethe cordfisrewound and it can therefore be seen that anintermittent revolving movement is 5 in one direction to lift tically.

If it is the screw 4: vertransmitted to the nut obvious that it isnecessary to reverse the movement of the nut 5.

Means have been provided for this end of the'quad purpose and theoperation of the mechanism applied will be as follows: Secured to theannular flange 16 and the drum 17 carried thereby, is a downwardlyextending lever 25. Formed on the lower end of said lever is a handle 26and formed .on the. opposite side of the lever is a project mg pin 27Secured to the base of the pedestal, or formed integral therewith, is aquadrant 28 and formed on the quadrant is a pair of notches 29 and 29*,positioned one at each lever 25 is secured at other of the quadrant bythe pin 27 engaging the notches described. Engagement of the lever withthe notch 29 secures the eccentricS in a position where the pinion 7will intermesh with the gear 6 and remain out of mesh with theintermediate gear 11. This position is maintained while the screw 4: isbeing raised vertically. If, however, it is desired to reverse themovement of the screw, it is only necessary for the operator to swingthe lever from the full line position shown in Fig. 2, to the dottedline position shown at 25, where the pin will engage the notch 29. Thismovement of the lever turns the eccentric to one side, thus swinging thepinion 7 awa I from the gear 6 and into mesh with the intermediate gear11. An alternate pull on the cord 14: will thus transmit power throughthe gears 7 and 11 to the gear 6 and in this manner reverse the turningmovement of the nut 5 and cause the screw to be lowered. Again, if it isdesired to raise the screw, it 1s only necessary to swing the lever 25over to the opposite end of the quadrant into engagement withnotch 29The gear 7 will thus move out of mesh with the intermediate gear andintermesh withgear 6, thus trans mittingpower directly thereto and aturning movement which willcause the screw to lift. From the foregoingdescription, it can readily be seen that-a simple mechanism has beenprovided for transmitting a turning movement to the nut 5 and that thismovement maybe instantly reversed by the operator by merely swinging thelever 25 from one rant to the other. The quadrant is in this instanceprovided with a bracket at one end, in which is supported a pulley 30.The cord employedfor the purunder the pulley 30, thereby causing thepull changesin theform, proportions and exerted tob'e transmittedto apoint as low down as possible with relation to the base of thepedes'talofQthe jack, thereby preventing the same from tipping overbefore a positive engagement 4 has been made with the I object be li d,I

, The materials and finish of the several parts employed may be such astheexperidictate wish understood that minor movement of the "connectingsaid transmitting details of construction may be resorted to within thescope of the appended claims and that I do not wish to limit myself tothe specific design and construction here shown.

Having thus described my invention, what I claim and desire to secure byLetters Patent is 1. A lifting jack comprising a pedestal, a nutturnably mounted thereon, a lifting screw carried by the nut, extendingthrough a central, vertical passage formed in the pedestal, a gearsecured to an extension formed on the nut, a second gear adapted to bemoved into or out of mesh with the first named gear, an intermediategear in constant mesh with the first named gear, means for transmittinga turning movement to the second named gear in one direction and meansfor moving said second named gear out of mesh with the first named gearand into mesh with the intermediate gear or vice versa.

2. A lifting jack comprising a pedestal, a nut turnably mounted thereon,a lifting screw carried by the nut, extending through a central,vertical passage formed in the pedestal, a gear secured to an extensionformed on the nut, a stud shaft secured on the pedestal, an eccentricturnably mounted on said shaft, a gear turnably mounted on theeccentric, a second stud shaft secured to the pedestal, an intermediategear journaled on said stud shaft adapted to con stantly intermesh withthe first named gear, means for transmitting a turning movement to thesecond named gear and means for turning the eccentric to movesaid'second named gear into mesh either with the first named gear or theintermediate gear.

3. A lifting jack comprising a pedestal,

a nutturnably mounted thereon, a lifting screw carried by the nut,extending through a central, vertical passage formed in the pedestal, agear secured to an extension formed on the nut, a stud shaft secured onthe pedestal, an eccentric turnably mounted on said shaft, a gearturnably mounted on the eccentric, a ratchet gear also turnably mountedon the eccentric in unison with the second named gear, a pulley turnablymounted on the eccentric, manually operated means for transmitting aturning movement tothe pulley a predetermined number of revolutions inone direction, automatic means for reversing the movement of the pulleythe same number of revolutions, means for transmitting the turningpulley to the second named gear and the ratchet named gear when manuallyturned, means for automatically (118- means when the pulley isautomatically reversed, an in termediate'gearin constant mesh with thefirst named gear, means for turning-[the eccentric to bring the secondgear into mesh movement when either with the first named gear or theintermediate gear and means for securing the eccentric against turningmovement when the second named gear is in mesh with either the firstnamed gear or the intermediate gear.

4. A lifting jack comprising a pedestal, a nut turnably mounted thereon,a lifting screw carried by the nut, extending through a centraLverticalpassage formed in the pedestal, a gear secured to an extension formed onthe nut, a stud shaft secured on the pedestal, an eccentric turnablymounted on said shaft, a gear turnably mounted on the eccentric, asecond stud shaft secured to the pedestal, an intermediate gearjournaled on said stud shaft adapted to constantly intermesh with thefirst named gear, means for transmitting a turning movement to thesecond named gear, means for turning the eccentric to move sa'd secondnamed gear into mesh either with the first named gear or theintermediate gear, and means for securing the eccentric against turningthe second named gear is in mesh either with the first named gear or theintermediate gear.

5. A lifting jack comprising a pedestal, a nut turnably mounted thereon,a lifting screw carried by the nut, extending through Copies of thispatent may be obtained for a central, vertical passage formed in thepedestal, a gear secured to an extension formed on the nut, a stud shaftsecured on the pedestal, an eccentric turnably mounted on said shaft, agear turnably mounted on the eccentric, a second stud shaft secured tothe pedestal, an intermediate gear journaled on said stud shaft adaptedto constantly intermesh with the first named gear, means fortransmitting a turning movement to the second named gear and means forturning the eccentric to move said second named gear into mesh eitherwith the first named gear or the intermediate gear and means forsecuring the eccentric against turning movement when the second namedgear is in mesh either with the first named gear or the intermediategear, said means comprising a lever secured to the eccentric, a quadrantover which said lever is adapte to swing and means at each end of thequadrant for securing the lever against swinging movement.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

WILLIAM H. FIREBAUGH, JR.

Witnesses:

B. O. COWAN, Com 0. RANKIN.

five cents each, by addressing the Gommissioner of ZE'atents,

Washington, D. G.

